SpacecraftCovariance Object

Description

The SpacecraftCovariance object represents the covariance associated with a Spacecraft. The size of the covariance matrix itself is equivalent to the total number of Spacecraft state elements being estimated or considered. Note that the Spacecraft covariance can be propagated without being included in an Orbit Determination process.

Users cannot create instances of this type of object. However, users can access instances of this object type that have been created indirectly, for example as children of other objects. Users can also access any static properties and methods on this object type.

Inheritance Hierarchy: Object->SpacecraftCovariance

Parent Object: SpacecraftODProperties

Available In Editions:

Engineer

Mission

Timing Precision Mode

This page describes functionality in nanosecond timing precision mode.

Click here to see the documentation for this object in millisecond timing precision mode.

Name	Description
ClearSavedStates	Clears previous saved states for this object.
GetCovarianceInFrame	Returns the covariance of the spacecraft state in the specified attitude reference frame. This method is only used with the Cartesian element set.
GetFromFile	Load the object state from the specified FreeFlyer object file.
GetFromString	Load the object state from the specified string.
GetOrbitStateCovarianceInElementSet	Returns the covariance of the orbit state in the specified element set.
GetSmoothedCovarianceInFrame	Returns the smoothed covariance of the spacecraft state in the specified attitude reference frame. This method is only used with the Cartesian element set.
GetStateSigmasInFrame	Returns an array containing the square root of the diagonal elements of the spacecraft state in the specified attitude reference frame. This method is only used with the Cartesian element set.
MapErrorEllipsoid	Determines the orientation and size of the Error Ellipsoid by calculating the Eigenvalues and Eigenvectors of the 3x3 position Covariance.
MapSmoothedErrorEllipsoid	Determines the orientation and size of the Error Ellipsoid by calculating the Eigenvalues and Eigenvectors of the Smoothed 3x3 position Covariance.
PutToFile	Convert the object state to FreeFlyer object xml and write to a file.
PutToString	Convert the object state to FreeFlyer object xml and return as a string.
ReferenceEquals	Returns 1 if the argument refers to the calling object and 0 otherwise.
Restore	Restore an object's state from a previously saved state.
Save	Save the object's state so that it can be restored later.
SetCovarianceInFrame	Sets the covariance of the spacecraft state in the inertial reference frame, after converting from the specified attitude reference frame. This method is only used with the Cartesian element set.
SetStateSigmasInFrame	Sets the Spacecraft covariance, converting from the specified input Attitude Reference Frame to the ICRF. The input sigmas are used as the Square Root of the diagonal of the input covariance. This method only works in conjunction with the Cartesian Element Set.